Why isn't this digging tool working with Filtering Enabled?

This digging tool digs out a small area of the terrain your mouse is on when you hold down the left mouse button.

With Filtering Enabled on, I have noticed that what the player digs out, is only visible to one player; the player who dug the terrain.

I can't seem to get it to work, no matter what I try.

The coding is this:

wait(1)
enabled = true
Tool = script.Parent
down = false -- Mouse isn't down
gui = script.LoadBar:clone() -- Displays your process in digging

-- auto-wedge fcn:
--sets cell x, y, z to default material if parameter is provided, if not sets cell x, y, z to be whatever material it previously was
--returns true if made a wedge, false if the cell remains a block
function MakeWedge(x, y, z, defaultmaterial)
    local c = game.Workspace.Terrain
    --gather info about all the cells around x, y, z
    surroundings = {} --surroundings is a 3 x 3 x 3 array of the material of the cells adjacent to x, y, z
    for i = x - 1, x + 1 do
        surroundings[i] = {}
        for j = y - 1, y + 1 do
            surroundings[i][j] = {}
            for k = z - 1, z + 1 do
                local material, wedge, rotation = c:GetCell(i, j, k)
                surroundings[i][j][k] = material.Value
            end
        end
    end
    --make some useful arrays and counters
    local sides = {} --sides is an array of the material of the 4 adjacent sides
    sides[0] = surroundings[x - 1][y][z]
    sides[1] = surroundings[x][y][z + 1]
    sides[2] = surroundings[x + 1][y][z]
    sides[3] = surroundings[x][y][z - 1]
    local adjacentSides = 0
    for n = 0, 3 do
        if sides[n] > 0 then
            adjacentSides = adjacentSides + 1
        end
    end
    local sidesAbove = {} --sides is an array of the material of the 4 adjacent sides 1 height above
    sidesAbove[0] = surroundings[x - 1][y + 1][z]
    sidesAbove[1] = surroundings[x][y + 1][z + 1]
    sidesAbove[2] = surroundings[x + 1][y + 1][z]
    sidesAbove[3] = surroundings[x][y + 1][z - 1]
    local adjacentSidesAbove = 0
    for n = 0, 3 do
        if sidesAbove[n] > 0 then
            adjacentSidesAbove = adjacentSidesAbove + 1
        end
    end
    local corners = {} --corners is an array of the material of the 4 adjacent corners
    corners[0] = surroundings[x - 1][y][z - 1]
    corners[1] = surroundings[x - 1][y][z + 1]
    corners[2] = surroundings[x + 1][y][z + 1]
    corners[3] = surroundings[x + 1][y][z - 1]
    local adjacentCorners = 0
    for n = 0, 3 do
        if corners[n] > 0 then
            adjacentCorners = adjacentCorners + 1
        end
    end
    local cornersAbove = {} --corners is an array of the material of the 4 adjacent corners 1 height above
    cornersAbove[0] = surroundings[x - 1][y + 1][z - 1]
    cornersAbove[1] = surroundings[x - 1][y + 1][z + 1]
    cornersAbove[2] = surroundings[x + 1][y + 1][z + 1]
    cornersAbove[3] = surroundings[x + 1][y + 1][z - 1]
    local adjacentCornersAbove = 0
    for n = 0, 3 do
        if cornersAbove[n] > 0 then
            adjacentCornersAbove = adjacentCornersAbove + 1
        end
    end
    --determine what type of wedge to make
    local material = nil
    local wedge = nil
    local rotation = nil 
    if defaultmaterial then
        material = defaultmaterial
    else
        material, wedge, rotation = c:GetCell(x, y, z) --start with the existing material, wedge, and rotation
    end
    wedge = 0 --default wedge is a block
    rotation = 0 --default rotation is 0
    --type 1: 45 degree ramp //must not have a block on top and must have a block under, and be surrounded by 1 side; or 3 sides and the 2 corners between them
    if surroundings[x][y + 1][z] == 0 and surroundings[x][y - 1][z] > 0 then
        if adjacentSides == 1 then
            for n = 0, 3 do
                if sides[n] > 0 then
                    wedge = 1
                    rotation = (n + 1) % 4
                    c:SetCell(x, y, z, material, wedge, rotation)
                    return true
                end
            end
        elseif  adjacentSides == 3 then
            for n = 0, 3 do
                if sides[n] > 0 and corners[(n + 1) % 4] > 0 and sides[(n + 1) % 4] > 0 and corners[(n + 2) % 4] > 0 and sides[(n + 2) % 4] > 0 then
                    wedge = 1
                    rotation = (n + 2) % 4
                    c:SetCell(x, y, z, material, wedge, rotation)
                    return true
                end
            end
        end
    end
    --type 2: 45 degree corner //must not have a block on top and must have a block under, and be surrounded by 2 sides and the 1 corner between them; or 3 sides and 1 corner between 2 of them (facing towards that corner)
    if surroundings[x][y + 1][z] == 0 and surroundings[x][y - 1][z] > 0 then
        for n = 0, 3 do
            if sides[n] > 0 and corners[(n + 1) % 4] > 0 and sides[(n + 1) % 4] > 0 and (adjacentSides == 2 or (adjacentSides == 3 and (corners[(n + 3) % 4] > 0 or (sides[(n + 2) % 4] > 0 and corners[(n + 2) % 4] > 0) or (sides[(n + 3) % 4] > 0 and corners[n] > 0)))) then
                wedge = 2
                rotation = (n + 2) % 4
                c:SetCell(x, y, z, material, wedge, rotation)
                return true
            end
        end
    end
    --type 3: 45 degree inverse corner //surrounded by three sides or 4 sides and 3 corners, with nothing above or else a block on top surrounded on 2 sides and the corner between them
    if adjacentSides == 3 and surroundings[x][y + 1][z] > 0 then
        if adjacentCorners > 1 then
            for n = 0, 3 do
                if (corners[n] == 0 or cornersAbove[n] == 0) and (sides[(n - 1) % 4] == 0 or sides[n] == 0) and (sidesAbove[n] == 0 and sidesAbove[(n + 1) % 4] > 0 and sidesAbove[(n + 2) % 4] > 0 and sidesAbove[(n + 3) % 4] == 0) then 
                    wedge = 3
                    rotation = (n + 3) % 4
                    c:SetCell(x, y, z, material, wedge, rotation)
                    return true
                end
            end
        end
    elseif adjacentSides == 4 and adjacentCorners == 3 then
        for n = 0, 3 do
            if corners[n] == 0 and (surroundings[x][y + 1][z] == 0 or (sidesAbove[n] == 0 and sidesAbove[(n + 1) % 4] > 0 and cornersAbove[(n + 2) % 4] > 0 and sidesAbove[(n + 2) % 4] > 0 and sidesAbove[(n + 3) % 4] == 0)) then
                wedge = 3
                rotation = (n + 3) % 4
                c:SetCell(x, y, z, material, wedge, rotation)
                return true
            end
        end
    end
    --type 4: half a cube, as if it were cut diagonally from front to back //surrounded by 2 sides
    if adjacentSides == 2 and adjacentCorners < 4 then
        for n = 0, 3 do
            if sides[n] == 0 and sides[(n + 1) % 4] == 0 and (surroundings[x][y + 1][z] == 0 or (sidesAbove[n] == 0 and sidesAbove[(n + 1) % 4] == 0 and sidesAbove[(n + 2) % 4] > 0 and sidesAbove[(n + 3) % 4] > 0)) then
                wedge = 4
                rotation = n
                c:SetCell(x, y, z, material, wedge, rotation)
                return true
            end
        end
    end
    c:SetCell(x, y, z, material, wedge, rotation)
    return false
end

function updateMouseRadius(mouse) -- Makes sure that while the player is digging he doesn't go move his mouse somewhere else going outside our magnitude
p = game.Players.LocalPlayer
if (mouse.Hit.p - p.Character.Torso.Position).magnitude > 20 then -- YOU RULE BREAKER!!!
onDeselect() -- Acts as if they stopped holding the mouse down
end
end



function onClick(mouse)
    h = game.Players.LocalPlayer.Character.Humanoid
    if not enabled or down or h == nil then
        return
    end
        p = game.Players.LocalPlayer
        if (p == nil) then return end
        if (p.Character == nil) then return end
        if (mouse.Hit.p - p.Character.Torso.Position).magnitude > 20 then return end
        down = true
        enabled = false
        c = game.Workspace.Terrain
        while down do
            Tool.Dirt.Smoke.Enabled = true
            if not p.PlayerGui:findFirstChild("LoadBar") then
                local l = gui:clone()
                l.Parent = p.PlayerGui
                script.Parent.guiObject.Value = l
            end
            local guivalue = p.PlayerGui:findFirstChild("LoadBar").Frame.LoadBarPercentage
            updateMouseRadius(mouse) -- Checks radius
            guivalue.Value = guivalue.Value + 3
            if guivalue.Value >= 100 then
                local cellPos = c:WorldToCellPreferSolid(Vector3.new(mouse.Hit.x, mouse.Hit.y, mouse.Hit.z))
                local x = cellPos.x
                local y = cellPos.y
                local z = cellPos.z     
                c:SetCell(x, y, z, 0, 0, 0)
                for i = x - 1, x + 1 do
                    for j = y - 1, y + 1 do
                        for k = z - 1, z + 1 do
                            MakeWedge(i, j, k)
                        end
                    end
                end
                Tool.Dirt.Smoke.Enabled = false
                onDeselect(mouse) -- Kills GUI
                enabled = false
                mouse.Icon = "rbxasset://textures\\GunWaitCursor.png"
                wait(0.5)
                mouse.Icon = "rbxasset://textures\\GunCursor.png"
                enabled = true
            end
        wait()
        end
end

function onClickOff(mouse)
Tool.Dirt.Smoke.Enabled = false
enabled = true
down = false
    if script.Parent.guiObject.Value ~= nil then
        script.Parent.guiObject.Value:remove()
    end
    if Tool.DiggyDiggyHole.Value ~= nil then
        Tool.DiggyDiggyHole.Value:Stop()
        Tool.DiggyDiggyHole.Value:remove()
    end
    Tool.GripForward = Vector3.new(0,0,-1)
    Tool.GripRight = Vector3.new(0,0,0)
    Tool.GripUp = Vector3.new(0, 1, 0)
    Tool.Animate.Disabled = true -- The script seems to crash after digging due to the animation becoming nil. Just restart it.
    Tool.Animate.Disabled = false
end

function onDeselect(mouse)
Tool.Dirt.Smoke.Enabled = false
enabled = true
down = false
    if script.Parent.guiObject.Value ~= nil then
        script.Parent.guiObject.Value:remove()
    end
    if Tool.DiggyDiggyHole.Value ~= nil then
        Tool.DiggyDiggyHole.Value:Stop()
        Tool.DiggyDiggyHole.Value:remove()
    end
    Tool.GripForward = Vector3.new(0,0,-1)
    Tool.GripRight = Vector3.new(0,0,0)
    Tool.GripUp = Vector3.new(0, 1, 0)
    Tool.Animate.Disabled = true -- The script seems to crash after digging due to the animation becoming nil. Just restart it.
    Tool.Animate.Disabled = false
end

function onSelect(mouse)
        mouse.Icon = "rbxasset://textures\\GunCursor.png"
        mouse.Button1Down:connect(function () onClick(mouse) end)
        mouse.Button1Up:connect(function () onClickOff(mouse) end)
end



script.Parent.Equipped:connect(onSelect)
script.Parent.UnEquipped:connect(onDeselect)

Any help is greatly appreciated!